Sand washing temporary-plugging agent particles prepared from waste superlight clay, sand washing temporary-plugging liquid and preparation

The invention provides sand washing temporary-plugging agent particles prepared from waste superlight clay, sand washing temporary-plugging liquid and preparation. The sand washing temporary-pluggingagent particles are prepared from waste superlight clay blocky objects and polyurethane waterproof coating layers wrapping the surfaces of the blocky objects. The sand washing temporary-plugging liquid is prepared from the following components in percentage by weight: 3-5% of the sand washing temporary-plugging agent particles, 2-3% of a thickener and the balance of water; and the sand washing temporary-plugging agent particles are prepared from the waste superlight clay blocky objects with the surfaces wrapped with the polyurethane waterproof coating layers. The sand washing temporary-plugging liquid achieves sand washing and temporary plugging in the thermal production well sand-washing process; and the advantages that raw material sources are wide, the waste superlight clay is fully utilized, a sand washing tem